Hollow Au–Ag Alloy Nanorices and Their Optical Properties

Yu, Keke; Sun, Xiaoduan; Pan, Liang; Liu, Ting; Liu, Anping; Chen, Guo; Huang, Yingzhou

doi:10.3390/nano7090255

Cited by 18 publications

(9 citation statements)

References 37 publications

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“…Therefore, we can match the obtained dark field scattering spectrum with its corresponding AuNC@J-agg individual, and the scattering spectrum and SEM image for points A and B are presented in Figure 3biii),ciii), respectively. These dark field measurements have been extensively used in the study of single nanoparticle systems (including our group) [14,21,22,36,37,38], demonstrating high reliability and stability. In our dark field measurements, close-packed AuNC@J-agg hybrids were also collected (Figure 3d).…”

Section: Resultsmentioning

confidence: 99%

Compounding Plasmon–Exciton Strong Coupling System with Gold Nanofilm to Boost Rabi Splitting

et al. 2019

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Various plasmonic nanocavities possessing an extremely small mode volume have been developed and applied successfully in the study of strong light-matter coupling. Driven by the desire of constructing quantum networks and other functional quantum devices, a growing trend of strong coupling research is to explore the possibility of fabricating simple strong coupling nanosystems as the building blocks to construct complex systems or devices. Herein, we investigate such a nanocube-exciton building block (i.e. AuNC@J-agg), which is fabricated by coating Au nanocubes with excitonic J-aggregate molecules. The extinction spectra of AuNC@J-agg assembly, as well as the dark field scattering spectra of the individual nanocube-exciton, exhibit Rabi splitting of 100–140 meV, which signifies strong plasmon–exciton coupling. We further demonstrate the feasibility of constructing a more complex system of AuNC@J-agg on Au film, which achieves a much stronger coupling, with Rabi splitting of 377 meV. This work provides a practical pathway of building complex systems from building blocks, which are simple strong coupling systems, which lays the foundation for exploring further fundamental studies or inventing novel quantum devices.

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Section: Resultsmentioning

confidence: 99%

Compounding Plasmon–Exciton Strong Coupling System with Gold Nanofilm to Boost Rabi Splitting

et al. 2019

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“…Silver or gold nanorice structures support both transverse and longitudinal resonances, with the latter tunable from the visible to the near-infrared spectral range by variation of the aspect ratio (length/diameter) 26 , 27 . With increasing aspect ratio of nanorice, higher-order multipolar LSPR modes can be excited 28 , 29 , which facilitates their applications in ultrasensitive sensing 28 , surface-enhanced Raman spectroscopy 29 , and catalysis 30 . These current studies of silver or gold nanorices won’t pay attention to multi-resonance phenomenon with the spatial overlap of the electric hotspots for surface enhancement hyper-Raman scattering.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of a plasmonic substrate with multi-resonance for surface enhanced hyper-Raman scattering

Zhu

Chen

Ding

et al. 2018

Sci Rep

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Because of the unique selection rule, hyper-Raman scattering (HRS) can provide spectral information that linear Raman and infrared spectroscopy cannot obtain. However, the weak signal is the key bottleneck that restricts the application of HRS technique in study of the molecular structure, surface or interface behavior. Here, we theoretically design and investigate a kind of plasmonic substrate consisting of Ag nanorices for enhancing the HRS signal based on the electromagnetic enhancement mechanism. The Ag nanorice can excite multiple resonances at optical and near-infrared frequencies. By properly designing the structure parameters of Ag nanorice, multi- plasmon resonances with large electromagnetic field enhancements can be excited, when the “hot spots” locate on the same spatial positions and the resonance wavelengths match with the pump and the second-order Stokes beams, respectively. Assisted by the field enhancements resulting from the first- and second-longitudinal plasmon resonance of Ag nanorice, the enhancement factor of surface enhanced hyper-Raman scattering can reach as high as 5.08 × 109, meaning 9 orders of magnitude enhancement over the conventional HRS without the plasmonic substrate.

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“…Therefore, AuCl − 4 ions will preferentially react with Ag atoms on the {111} plane. Owing to the Kirkendall effect [46,49], Ag-Au bimetallic nanoprisms with numerous nanometer size protrusions and pores can be obtained, that is, roughened nanoporous Ag-Au bimetallic TNPs, as shown in Figure 1(c). It is interesting to know that the average particle size of TNPs is almost unaffected before (~284 nm) and after (~289 nm) the galvanic displacement (see Figure S2), which also confirmed that the formations of nanoporous Ag-Au alloyed nanoprisms are based on the galvanic displacement by using the Ag nanoprisms as a frame.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Ag-Au Bimetallic Triangular Nanoprisms Synthesized by Galvanic Replacement for Plasmonic Applications

Anwer

Bharath

et al. 2018

Journal of Nanomaterials

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Galvanic replacement is a versatile method of converting simple noble metallic nanoparticles into structurally more complex porous multimetallic nanostructures. In this work, roughened nanoporous Ag-Au bimetallic triangular nanoprisms (TNPs) are synthesized by galvanic replacement between smooth Ag triangular plates and AuCl − 4 ions. Transmission electron microscope and the elementary mapping measurements show that numerous protrusions and pores are formed on the {111} facets, and Ag and Au atoms are homogeneously distributed on the triangular plates. Due to the additional "hot spots" generated by the surface plasmon coupling of the newly formed protrusions and pores, the roughened nanoporous Ag-Au TNP aggregates demonstrate a higher surface-enhanced Raman scattering enhancement factor (seven times larger) and better reproducibility than that of smooth Ag triangular particle aggregates. These synthesized roughened nanoporous Ag-Au bimetallic TNPs are a promising candidate for the applications in analytical chemistry, biological diagnostics, and photothermal therapy due to their excellent plasmonic performances and good biocompatibility.

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Hollow Au–Ag Alloy Nanorices and Their Optical Properties

Cited by 18 publications

References 37 publications

Compounding Plasmon–Exciton Strong Coupling System with Gold Nanofilm to Boost Rabi Splitting

Compounding Plasmon–Exciton Strong Coupling System with Gold Nanofilm to Boost Rabi Splitting

Theoretical investigation of a plasmonic substrate with multi-resonance for surface enhanced hyper-Raman scattering

Nanoporous Ag-Au Bimetallic Triangular Nanoprisms Synthesized by Galvanic Replacement for Plasmonic Applications

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